A 42-year-old man presented to clinic with 1-week history of cough, malaise, loss of appetite and fever. Symptoms started acutely with cough and generalised weakness followed by fever, chills, nausea, vomiting and diarrhoea. He has been healthy before with no chronic illnesses. Further workup disclosed, leucocytosis with 87% eosinophilia, bilateral lung infiltrate, deep venous thrombosis, pulmonary embolism and both right and left biventricular mural thrombi. Extensive workup was done and was consistent with hypereosinophilic syndrome, which explained all his clinical findings. The patient was started on high-dose steroids and responded very well with a complete resolution of symptoms over the course of a few weeks.